TDGC2 AC Single Phase Variable Transformer 500VA-30KVA | Wilmall

Overview

The WILMALL TDGC2 variac is a hand-operated AC voltage regulator built around a toroidal auto-transformer and a carbon brush wiper. Turning the front knob moves the brush along the exposed winding track, so output voltage changes smoothly and steplessly from zero to line voltage – no electronics, no switching noise, just a direct copper-to-carbon contact that has powered test benches for decades.

Full Model Range

Dimensions and weight shift slightly with the output range you choose; the table reflects standard 220V/0-250V builds.

What Makes the WILMALL TDGC2 Dependable

Every unit leaves our Yueqing workshop with the same checklist, regardless of whether it is a 500VA lab unit or a 30KVA workshop model:

• Copper, not aluminium. The toroidal winding uses class-B insulated copper magnet wire, so the resistance stays low and the output voltage holds steady under load.
• Carbon brush grade matters. We fit a longer-life carbon brush compound than generic spares; it seats cleanly on the winding track and only needs replacement after tens of thousands of turns.
• Ventilation geometry. The shell is punched with a full ventilation pattern, keeping the winding below 60°C rise even at nameplate rating in a warm workshop.
• Fire-safe enclosure. The powder-coated steel shell is fully flame retardant, so a shorted load or overheated winding cannot feed a fire outside the case.
• Every unit is tested. Insulation resistance (above 5MΩ), 2000V/1min dielectric withstand and a loaded output check are recorded before packing.

Where Our Customers Put It to Work

The TDGC2 shows up in more places than you might expect:

• R&D benches where engineers simulate “mains stress” by sweeping an appliance from 100V to 250V and watching for brownout behaviour.
• Motor workshops pre-running a single phase motor below rated speed to verify winding balance before handing it back to the client.
• Hotels and restaurants dimming ballroom lighting without installing dedicated dimmer racks.
• Heat-treatment shops regulating electric furnace element power in small batches.
• Export QC lines checking 120V US appliances on 220V mains – the variac steps the bench supply to exactly 120V.
• Schools and technical colleges demonstrating AC power control to electrical apprentices.

How to Choose the Right Rating

• Add up the wattage of everything you will connect at once.
• Resistive loads (heaters, lamps): choose a rating 1.2-1.3x the load.
• Inductive loads (motors, transformers): choose 2-3x the load – inrush current is several times running current.
• Uncertain? Start with our transformer sizing calculator, then confirm with us before ordering.

Frequently Asked Questions

Do I still need a separate voltmeter?

Not if you order the LCD display option – the front panel shows input and output voltage live. The standard version has a rotary dial scale, which is fine for rough settings.

Can the TDGC2 step 110V up to 220V?

Yes – order the 110V-input version and it works in reverse as a step up regulator. Tell us your input voltage when ordering.

What is the maximum current I can draw?

It depends on the model: 2A at 500VA up to 120A at 30KVA. The dial plate marks the current limit for your model – stay under it.

Do you make a three phase version?

Yes – see the TSGC2 three phase variac in the same category, or tell us your kVA and input voltage.

Ordering and Warranty

MOQ is 10 pcs with a 15-25 day lead time. We can brand the enclosure, fit your plug type, and supply 110V or 0-300V builds. Every order carries a 12-month warranty. Send your spec and we will quote within 24 hours – or browse the full variable transformer range for other options.

Frequently asked questions